For travellers who are understandably worried about being spied on, there are a number of ways to check if your room has been fitted with a hidden camera - including by looking out for unusual wires or objects in the room that are out of the ordinary.

There are also a number of mobile apps - both free and paid for - that developers say you can use to detect any hidden cameras.

They work in two different ways - by using infrared technology to find lights or using magnetic waves to detect radiation from hidden devices.

So if you're worried about being spied on, here are a few apps you can try:

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Some appliances could be hiding a pinhole camera in themCredit: Getty - Contributor